$2z^2+3z-20$
$-125-69$
$20^{-2}\cdot20^2$
$\frac{d}{dx}\ln\left(2x+y\right)$
$\left(x^2+x+1\right)-\left(x^2-1\right)$
$\frac{25b^6-64}{5b^3+8}$
$7x+4=8x-2$
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